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Dewalt Table Saw Fence (Rack & Pinion) problem...

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Forum topic by BGW posted 09-23-2014 02:52 PM 8195 views 0 times favorited 6 replies Add to Favorites Watch
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BGW

164 posts in 1467 days


09-23-2014 02:52 PM

Friends,

I am appealing to you all for some help with my Dewalt DW745 table saw. As some of you know, this saw boasts a rack & pinion fence system that is supposed to be easy to use and accurate. When I first bought mine, never slid softly like it’s supposed to, but it didn’t matte that much to me, because I was able to move it.

Over the past year, as I’ve used and abused it, the rack and pinion gears have become more and more tight…now they completely bindup and I’m virtually unable to move it at all.

Has anyone else had this issue, and if so…how did you rectify it?

-- Bob, Indiana, "Well done is better than well said." -Ben Franklin http://www.bgwconstructionllc.com/


6 replies so far

View paxorion's profile

paxorion

1100 posts in 1506 days


#1 posted 09-23-2014 03:10 PM

Are the gears thrown out of alignment by chance? Any suggestions from Dewalt support?

-- paxorion

View BGW's profile

BGW

164 posts in 1467 days


#2 posted 09-23-2014 04:32 PM

I’m sure that’s what it is, I just can’t get them re-aligned…

-- Bob, Indiana, "Well done is better than well said." -Ben Franklin http://www.bgwconstructionllc.com/

View gabriellus's profile

gabriellus

47 posts in 838 days


#3 posted 09-23-2014 05:44 PM

I have the DWE7491RS with the similar rack and pinion fence. I recently had to entirely disassemble the fence and rail system as the rail was just crazily bogged down, the handle was just impossible to twist. After taking it apart, it was clear it was the rails themselves taking in chips and dust and getting gummed up. I’ve cut mostly pine, you see. Next time I’ll add some teflon spray that I bought since I reassembled, I bet that will help. The rack and pinion part was fine, but you WILL need to realign/adjust the fence when you get it all back together.

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BGW

164 posts in 1467 days


#4 posted 09-23-2014 06:08 PM

Thanks, Gabriellus…that’s what I was thinking about doing, but I wanted to see if anyone had the same experience. We use it a lot with PT material, so I imagine there is quite a bit of gumming going on.

-- Bob, Indiana, "Well done is better than well said." -Ben Franklin http://www.bgwconstructionllc.com/

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gabriellus

47 posts in 838 days


#5 posted 09-24-2014 06:45 PM

Not a problem, glad to help!

As a side note, your post got me thinking to do that work. Having now taken it apart for a second time, I noticed that in my case, the most problematic area in the rail assembly was the contacts of what Dewalt calls the Rail Lock. When you lock the fence in position, you push down a lever which in turn pushes out a metal pin against inside the front and rear rail, locking it in place. It seemed like in the unlocked position, the pin was still too far out, binding up the rail. In any case, disassembling everything and hitting all sides of the rail/gear/teeth/runners pretty hard with this seemed to get me back to near factory condition.

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gabriellus

47 posts in 838 days


#6 posted 01-08-2015 07:21 PM

I thought I’d repost with an update. Just performed the Rail Lock Adjustment (page 7 Fig 17 in the DWE7491RS manual). In order to loosen the jam nut (JJ) I needed locking pliers and a great deal of force. Once loosened, I adjusted the hex rod (KK) to the loosest it would go and still lock the fence snugly, which in my case seems a great deal indeed. After that it has been a dream, no binding in any way whatsover.

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